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LibC: Add support for posix_madvise(..)

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Add the `posix_madvise(..)` LibC implementation that just forwards
to the normal `madvise(..)` implementation.

Also define a few POSIX_MADV_DONTNEED and POSIX_MADV_NORMAL as they
are part of the POSIX API for `posix_madvise(..)`.

This is needed by the `fio` port.
This commit is contained in:
Brian Gianforcaro 2021-12-22 00:05:10 -08:00 committed by Brian Gianforcaro
parent ba9a525ba6
commit c724955d54
3 changed files with 17 additions and 0 deletions
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10
Kernel/API/POSIX/sys/mman.h
View file

@ -31,10 +31,20 @@ extern "C" {
#define MAP_FAILED ((void*)-1)
#define MADV_NORMAL 0x0
#define MADV_SET_VOLATILE 0x1
#define MADV_SET_NONVOLATILE 0x2
#define MADV_DONTNEED 0x3
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_madvise.html
#define POSIX_MADV_NORMAL MADV_NORMAL
#define POSIX_MADV_DONTNEED MADV_DONTNEED
// Unsupported posix_madvise() advise:
// POSIX_MADV_SEQUENTIAL
// POSIX_MADV_RANDOM
// POSIX_MADV_WILLNEED
#define MS_SYNC 1
#define MS_ASYNC 2
#define MS_INVALIDATE 4

6
Userland/Libraries/LibC/sys/mman.cpp
View file

@ -77,6 +77,12 @@ int madvise(void* address, size_t size, int advice)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_madvise.html
int posix_madvise(void* address, size_t len, int advice)
{
return madvise(address, len, advice);
}
void* allocate_tls(const char* initial_data, size_t size)
{
ptrdiff_t rc = syscall(SC_allocate_tls, initial_data, size);

1
Userland/Libraries/LibC/sys/mman.h
View file

@ -18,6 +18,7 @@ int munmap(void*, size_t);
int mprotect(void*, size_t, int prot);
int set_mmap_name(void*, size_t, const char*);
int madvise(void*, size_t, int advice);
int posix_madvise(void*, size_t, int advice);
void* allocate_tls(const char* initial_data, size_t);
int mlock(const void*, size_t);
int munlock(const void*, size_t);